impossible people

The last week I had no lessons so apart from a couple of tasks I was free to practice my own things. At the moment I am dedicated to practicing drawing the human form, male and female, in all manner of different poses. I am taking instruction from a great book by Andrew Loomis. The book is quite academic and in depth which is good as my aim is to be able to draw aesthetically pleasing people. First i learned the proportions in head sizes, then a basic mannequin, then the difference between a male and female body and now I am going to attempt to learn much of the human anatomy starting from the skeleton and then the muscles and how they attach.
  Here are some weak first attempts, I will improve!!!!!!!!!!!

Here is the rough mannequin and a couple of quick poses